<!DOCTYPE html>
<html>
<head>
<script>

function b() { 
  try { sset("u"); } catch(e) { }
  try { [0].map(b); } catch(e) { }
}

var sset = document.documentElement.style.__lookupSetter__("textIndent");
b();

</script>
</head>

<body></body>
</html>

